If it's just the two of them we need to work out what is different about their setups compared with everyone elses; and which would also be affected by 2.0 and not 1.0.

Well, here's something I haven't mentioned yet. My alarm has an "extended accessory power" module, which basically keeps everything on until a door is opened. So every time I have been referring to turning the ignition off, I really meant turning the ignition off and opening a door. When I tested with a multimeter, I still had 12-14v on the ignition sense wire with the ignition off before the doors were opened. After opening a door it dropped right to 0v. I didn't think this was an issue because many luxury type cars have this feature. This shouldn’t affect anything, right?

Tom